Rain has stopped, getting ready to take a walk in the woods to find a nice place to let this little guy go...
 
Julien
 

Aww...  I like little bunnies - can't help it.  Unfortunately, that little guy may be doomed.  Unless you can find Momma and she takes him back, he may be a goner.  We had the neighbor cat get two and, even though we got them back to the backyard with Momma, only the one the cat didn't get survived...  (Of course, that one grew up to be almost a pet - at least until she became a meal for a coyote, I still have that vision in my head of the coyote jogging down the street with her crying in his mouth - not a favorite memory.)
 
Hopefully, you're little guy has a happier ending!
 
Bunnies - Nature's fast food...
 
 

Assuming that the bunny was not inoculated with a fata infection by the cat bite, it possible to rescue it if you are willing to go to the trouble. I had at least one successful experience by putting the bunny in with a nursing litter of kittens. I was a kid, and surprisingly, mom did not eat it, but that may be just a miracle of nature. Otherwise it can be pretty demanding and fraught with uncertainty.
 
http://www.2ndchance.info/bunnies.htm

We have one our kid just had to have...a miniature. First rabbit I've ever seen as a pet and they're pretty clean. Uses a litter box and plays with the parakeet. The kid and her were showing us her "Jack in box" imitation.

We researched and at three weeks they leave the den on their own. You can tell if they are three weeks because at that age their ears stand up and these were (I just got another one and took it to the kudzu patch). I will have to keep an eye out tomorrow. They didn't seem to be bitten and the cat has all her shots so maybe they will make it, they can eat kudzu. She is surprisingly gentle with them.
 
J

 
Here's a collage of the little one mentioned above who survived the cats, but not the coyote (no idea when Mom disappeared either).

 Talk about synchronicity. I recently observed a few bunnies  as I came around the corner at a creek I pass on the way to work. The whole thing caught me by surprise because these bunnies were making other bunnies right along the road.  They are fast at everything.
 
True bunny story number two- One was trapped in my back yard because it's all fenced in. This rabbit must have found a way in but had forgotten how to get back out, or maybe grew too large to exit from eating the vegetables in my garden. It has been there ever since, dug a hole in one of my raised bed gardens and I think it has a family now. 
 
 Best wishes in finding a way for your orphan bunny.

"Rescue Shelter"

A guy I met while house hunting raises domestic rabbits in his back yard. Actually, they run free everywhere. His neighbor got mad at him because they would invade her yard and eat all her flowers. Then a wild lynx caught wind of the enormous food source he was providing and moved in to raise her family. As a result this guy took to shooting the lynx for their pelts.
 
I should report him. Then again if he's on this forum I've just been made.

All I know on this subject is that shooting neighbors for their pelts is often frowned upon.